When studying up on the Borg in late 2373, Captain Janeway researched Captains Amasov's and Jean-Luc Picard's logs of encounters with them. (VOY: "Scorpion")
This character was only mentioned in dialogue.
As evidenced by the first draft script of "Scorpion", this character was originally named "Amasova". He was named for Isaac Asimov, famous 20th century science-fiction writer, cybernetics supporter, and friend of Gene Roddenberry. (Star Trek Encyclopedia (4th ed., vol. 1, p. 22))
The RPG book Starships gives him the first name Joseph.